Search Results:　 1-20 of 56

1

Symmetry and Topology in Superconductors ---Odd-Frequency Pairing and Edge States---

Tanaka Yukio , Sato Masatoshi , Nagaosa Naoto

… Superconductivity is a phenomenon where the macroscopic quantum coherence appears due to the pairing of electrons. … Especially, the symmetry properties of the pairing, i.e., the parity and spin-singlet/spin-triplet, determine the physical properties of the superconducting state. … Especially, this is the case in the Andreev bound state (ABS) appearing at the surface/interface of the sample. …

J Phys Soc Jpn 81(1), 011013-011013-34, 2012-01-15

The Physical Society of Japan
2

Macroscopic Quantum Tunneling and Avalanche Size Distribution of 4He Crystallization in Aerogel

Nomura Ryuji , Matsuda Hirofumi , Masumoto Ryota , Ueno Ken-ichi , Okuda Yuichi

… It is found from a crystallization rate measurement of 4He in silica-aerogels that crystals grow via thermal activation in a high-temperature creep region and via macroscopic quantum tunneling in a low-temperature avalanche region. … Avalanche size distribution follows a power law in a 98% porosity aerogel and indicates that the system is in a self-organized critical state (SOC) in the growth regime via quantum tunneling. …

J Phys Soc Jpn 80(12), 123601-123601-4, 2011-12-15

The Physical Society of Japan
3

Relaxation to equilibrium in macroscopic quantum systems : foundation of statistical mechanics(Perspectives of Nonequilibrium Statistical Physics-The Memory of Professor Shuichi Tasaki-)

Monnai Takaaki

… In conclusion, by assuming that the initial state is prepared as a microcanonical ensemble, the actual state at time t=T can be replaced by another microcanonical ensemble in the evaluation of macroscopic quantities. …

Bussei Kenkyu 97(3), 440-449, 2011-12-05

CiNii Fulltext PDF - Open Access
4

Experimental Studies of Superconductivity as Macroscopic Quantum Phenomena(Celebrating the Centenary of Superconductivity) [in Japanese]

Nakamura Yasunobu

巨視的量子効果としての超伝導に関わる実験の歴史と最近の進展を概観する.特に超伝導秩序パラメータの位相がどのようにして理解され,制御されてきたかということに注目する.巨視的量子コヒーレンスや量子計算といった新しい概念が大きな動機付けとなって研究が進み,電気回路上で人工的な量子力学系を設計しその量子状態を自在に操ることができるようになってきている.

Butsuri 66(10), 762-769, 2011-10-05

CiNii Fulltext PDF - Subscription References (70)
5

Microscopic Magnetization Process in Tb

Agui Akane , Matsumoto Sayaka , Sakurai Hiroshi , Tsuji Naruki , Homma Satoshi , Sakurai Yoshiharu , Itou Masayoshi

… The magnetic properties reflected in a macroscopic hysteresis loop are dominated by both spin and orbital moments. … In this study, spin-specific magnetic hysteresis (SSMH) and orbital-specific magnetic hysteresis (OSMH) loops were obtained for amorphous Tb<sub>43</sub>Co<sub>57</sub>film by using a combination of Compton scattering and superconducting quantum interference device (SQUID) measurements. …

Applied Physics Express 4(8), 083002-083002-3, 2011-08-25

The Japan Society of Applied Physics
6

The search for macroscopic quantum limit by superconducting flux qubit <Summaries of the Doctoral Theses> [in Japanese]

藤井敏之 , フジイトシユキ , Fujii Toshiyuki

… Quantum mechanics has predicted many counterintuitive phenomena in daily life, and has changed our view of the world. … Among such predictions, the existence of a macroscopic object in superposition is especially unbelievable. …

広島大学大学院総合科学研究科紀要. II, 環境科学研究 5, 117-120, 20101231-00-00

IR
7

Multi-Junction Switching in Bi2Sr1.6La0.4CuO6+\delta Intrinsic Josephson Junctions

Kashiwaya Hiromi , Matsumoto Tetsuro , Shibata Hajime , Eisaki Hiroshi , Yoshida Yoshiyuki , Kambara Hiroshi , Kawabata Shiro , Kashiwaya Satoshi

… We study the dynamics of multi-junction switching (MJS): several intrinsic Josephson junctions (IJJs) in an array switch to the finite voltage state simultaneously. … The independence of the escape rates of $N$ in the macroscopic quantum tunneling regime indicates that MJS is a successive switching process rather than a collective process. …

Applied Physics Express 3(4), 043101-043101-3, 2010-04-25

The Japan Society of Applied Physics References (13)
8

Toward a superconducting quantum computer Harnessing macroscopic quantum coherence:Harnessing macroscopic quantum coherence

TSAI Jaw-Shen

… Intensive research on the construction of superconducting quantum computers has produced numerous important achievements. … The quantum bit (qubit), based on the Josephson junction, is at the heart of this research. … This macroscopic system has the ability to control quantum coherence. … This article reviews the current state of quantum computing as well as its history, and discusses its future. …

Proceedings of the Japan Academy, Series B 86(4), 275-292, 2010

J-STAGE CrossRef
9

Switching current distributions and macroscopic quantum tunneling in over-doped BSCCO mesas with nanometer thickness

Kakeya Itsuhiro , Hamada K , Tachiki T , Watanabe T , Suzuki M

… The highest critical current density of the zero-voltage state as Jc1 = 3.2 kA cm－2 among our micron-scale mesa structures of BSCCO cuprates are achieved. … Narrowing of the switching probability distribution (SPD) due to suppression of the thermal fluctuation tends to saturate at 5 K, which is regarded as a symptom of macroscopic quantum tunneling (MQT). …

Superconductor Science and Technology 22(11), 2009-11-01

IR CrossRef
10

1H-NMR Spin–Lattice Relaxation Rate of the Quantum Spin System (CH3)2CHNH3Cu(ClxBr1-x)3 with $x=0$ and 0.35

Oosawa Akira , Suzuki Takao , Kanada Keishi , Kojima Satoshi , Goto Takayuki , Manaka Hirotaka

… Previous macroscopic magnetization and specific heat measurements suggested that these two exist in a singlet-dimer phase. … The temperature dependence of T1-1 in an x = 0 system decreased exponentially toward zero, providing microscopic evidence of a gapped singlet ground state, which is consistent with results of macroscopic experiments. …

J Phys Soc Jpn 78(5), 053702-053702-4, 2009-05-15

IR The Physical Society of Japan References (31)
11

First-Principle van der Waals Force Calculations Based on Density Functional Theory(Current Status and Future Prospect of First-Principles Electronic Structure Calculations) [in Japanese]

Tsuneda Takao , Sato Takeshi

近年,ナノ材料科学における自己集合や生命科学における機能的構造形成など,ファンデルワールス力にもとづくマクロな現象が,広範な研究分野で注目を集めている.ファンデルワールス力は電子相関にもとづく純粋に量子論的な効果であり,なおかつ系のスケールに応じて重要性を増す.したがって,その理論的な解明には電子相関を考慮に入れた高速計算が可能な第一原理計算法が必要である.本稿では,密度汎関数法にもとづく第一原理 …

Butsuri 64(4), 291-296, 2009-04-05

CiNii Fulltext PDF - Open Access References (29)
12

Comparative study of macroscopic quantum tunneling in Bi2Sr2CaCu2Oy intrinsic Josephson junctions with different device structures

Ota K. , Hamada K. , Takemura R. , Ohmaki M. , Machi T. , Tanabe K. , Suzuki M. , Maeda A. , Kitano H.

… We investigated macroscopic quantum tunneling (MQT) of Bi2Sr2CaCu2Oy intrinsic Josephson junctions (IJJs) for two device structures. … The experimental results regarding the switching-current distribution for the first switch from the zero-voltage state were in good agreement with the conventional theory for a single Josephson junction, indicating that the crossover temperature from thermal activation to the MQT regime for the former device structure was similar to that for the latter device structure. …

PHYSICAL REVIEW B 79(13), 2009-04-00

IR CrossRef
13

29pSK-4 A possible Efimov state in three-component lithium 6

Naidon Pascal , Ueda Masahito

Meeting abstracts of the Physical Society of Japan 64(1-2), 170, 2009-03-03

CiNii Fulltext PDF - Open Access
14

Muon spin relaxation detection of the soft mode toward the exotic magnetic ground state in the bond-disordered quantum spin system IPA-Cu(Cl0.35Br0.65)3

Goto Takayuki. , Suzuki Takao. , Kanada Keishi. , Saito Takehiro. , Oosawa Akira. , Watanabe Isao. , Manaka Hirotaka.

… The spin-gap system with a bond-disorder (CH3)2CHNH3-Cu(ClxBr1?x)3 is reported by experiments on macroscopic quantities of the uniform susceptibility and the specific heat to show a magnetic order at low temperatures (when the value of x is within the limited region between 0.44 and 0.87) and otherwise a gapped behavior. …

Physical Review B 78(5), 054422-1-054422-6, 2008-00-00

IR CrossRef
15

Microinhomogeneity for Aqueous Mixtures of Water-miscible Organic Solvents(<Feature> Aqueous Solution Science for Ceramic Processing)

TAKAMUKU Toshiyuki , NOGUCHI Yasukuni , NAKANO Miki , MATSUGAMI Masaru , IWASE Hiroki , OTOMO Toshiya

… It has been shown that the organic solvent and water molecules are inhomogeneously mixed each other at the molecular level, although their mixtures are homogeneous at the macroscopic scale. …

Journal of the Ceramic Society of Japan 115(1348), 861-866, 2007-12-01

CiNii Fulltext PDF - Open Access References (23)
16

A Toroidally Folded Monomolecular DNA Chain : From the perspective of colloidal physics(Poster session 2, New Frontiers in Colloidal Physics : A Bridge between Micro- and Macroscopic Concepts in Soft Matter)

Iwaki Takafumi , Makita Naoko , Yoshikawa Kenichi

DNAは荷電高分子として振る舞い静電相互作用を通して溶液中の様々なイオンとの間に複合体を作っている。溶液条件によってはこのような複合体は分子全体を覆いDNAのセグメント同士が凝集したグロビュールと呼ばれる構造を作ることがある。T4DNAの場合、典型的なグロビュールはトロイド構造をしており、このことから、グロビュールへの折りたたみ転移は分子鎖上でのループ形成とループ構造同士の凝集という二つの過程を通 …

Bussei Kenkyu 89(1), 134-135, 2007-10-20

CiNii Fulltext PDF - Open Access IR
17

Rapid Suppression of Phase IV by Nd Doping in Ce_<0.7>La_<0.3>B_6(Condensed matter : electronic structure and electrical, magnetic, and optical properties)

KONDO Akihiro , TOU Hideki , SERA Masafumi , IGA Fumitoshi , SAKAKIBARA Toshiro

… The macroscopic properties in phase IV are not affected by the Nd doping. … This mixed state is unstable and is easily changed to phase III by applying the magnetic field. …

Journal of the Physical Society of Japan 76(10), "103708-1"-"103708-4", 2007-10-15

CiNii Fulltext PDF - Paid The Physical Society of Japan References (17)
18

^1H-NMR Study of the Random Bond Effect in the Quantum Spin System (CH_3)_2CHNH_3Cu(Cl_xBr_<1-x>)_3(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

ADACHI Tomoya , KANADA Keishi , SAITO Takehiro , OOSAWA Akira , GOTO Takayuki

… The spin-lattice relaxation rate T^<-1>_1 of ^1H-NMR has been measured in (CH_3)_2CHNH_3Cu(Cl_xBr_<1-x>)_3 with x=0.88, which is reportedly a gapped system with a singlet ground state from the previous macroscopic magnetization and specific heat measurements, in order to investigate the bond randomness effect microscopically in the gapped composite Haldane system (CH_3)_2CHNH_3CuCl_3. …

Journal of the Physical Society of Japan 76(8), "083701-1"-"083701-4", 2007-08-15

CiNii Fulltext PDF - Paid The Physical Society of Japan References (20)
19

Generation of Macroscopic Entangled States in Coupled Superconducting Phase Qubits(Cross-disciplinary physics and related areas of science and technology)

MATSUO Shigemasa , ASHHAB Sahel , FUJII Toshiyuki , NORI Franco , NAGAI Katsuhiko , HATAKENAKA Noriyuki

… We consider the possibility of generating macroscopic entangled states in capacitively coupled phase qubits. … We then analyze two possible procedures that can be used to generate n-qubit entangled states, such as the Greenberger-Horne-Zeilinger state for the case n = 3. …

Journal of the Physical Society of Japan 76(5), "054802-1"-"054802-6", 2007-05-15

CiNii Fulltext PDF - Paid IR The Physical Society of Japan References (34)
20

Frustrating Quadrupolar Interaction and Possible Pressure Effects in PrOs_4Sb_<12>(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

SHIINA Ryousuke

… In this paper, we investigate the properties of the possible AFQ state in lower magnetic fields which can be realized with hydrostatic and uniaxial pressures. … Making use of a new pseudo-spin description, we show that the AFQ model at zero field is well approximated as the quantum four-state Potts model with macroscopic ground-state degeneracy. …

Journal of the Physical Society of Japan 75(11), "114708-1"-"114708-9", 2006-11-15

CiNii Fulltext PDF - Paid The Physical Society of Japan References (27)

Search Results:　 1-20 of 56

Related Authors

Related Journals

Search Results: 1-20 of 56

Related Authors

Related Journals

Search Results:　 1-20 of 56